Microwave assisted eco-friendly synthesis of chalcones using 2,4-dihydroxy acetophenone and aldehydes as corrosion inhibitors for mild steel in 1M HCl

In the present investigation we have synthesized four chalcones namely 3-(4- chlorophenyl)-1-(2, 4-dihydroxyphenyl) prop-2-en-1-one (CHAL-1), 1-(2, 4- dihydroxyphenyl)-3-p-tolylprop-2-en-1-one (CHAL-2) 1-(2, 4-dihydroxyphenyl)-3-(2- hydroxyphenyl) prop-2-en-1-one (CHAL-3) and 1-(2, 4-dihydroxyphenyl)-3-(4-hydroxy-3- methoxyphenyl) prop-2-en-1-one (CHAL-4) and premeditated their corrosion inhibition property on mild steel (MS) in 1M HCl using chemical and electrochemical methods. The scanning electron microscopic (SEM) study reveals the formation of protective film of chalcones on MS surface. Presence of elements on MS surface was also studied using high energy dispersive (EDX) technique. Potentiodynamic polarization study reveals that chalcones are of mixed type inhibitors. Weight -loss experiment also performed at different temperature in order to derive thermodynamic parameters and to explain mechanism of adsorption.